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f5796684 JG |
1 | /* |
2 | * Copyright (c) 2014 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
11 | ||
12 | #include <linux/version.h> | |
13 | ||
14 | #include <linux/in.h> | |
15 | #include <linux/ip.h> | |
16 | #include <linux/net.h> | |
17 | #include <linux/rculist.h> | |
18 | #include <linux/udp.h> | |
19 | #include <linux/if_vlan.h> | |
20 | ||
21 | #include <net/geneve.h> | |
22 | #include <net/icmp.h> | |
23 | #include <net/ip.h> | |
24 | #include <net/route.h> | |
25 | #include <net/udp.h> | |
26 | #include <net/xfrm.h> | |
27 | ||
28 | #include "datapath.h" | |
29 | #include "vport.h" | |
30 | ||
31 | /** | |
32 | * struct geneve_port - Keeps track of open UDP ports | |
33 | * @sock: The socket created for this port number. | |
34 | * @name: vport name. | |
35 | */ | |
36 | struct geneve_port { | |
37 | struct geneve_sock *gs; | |
38 | char name[IFNAMSIZ]; | |
39 | }; | |
40 | ||
41 | static LIST_HEAD(geneve_ports); | |
42 | ||
43 | static inline struct geneve_port *geneve_vport(const struct vport *vport) | |
44 | { | |
45 | return vport_priv(vport); | |
46 | } | |
47 | ||
48 | static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) | |
49 | { | |
50 | return (struct genevehdr *)(udp_hdr(skb) + 1); | |
51 | } | |
52 | ||
53 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ | |
54 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) | |
55 | { | |
56 | #ifdef __BIG_ENDIAN | |
57 | vni[0] = (__force __u8)(tun_id >> 16); | |
58 | vni[1] = (__force __u8)(tun_id >> 8); | |
59 | vni[2] = (__force __u8)tun_id; | |
60 | #else | |
61 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); | |
62 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); | |
63 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); | |
64 | #endif | |
65 | } | |
66 | ||
67 | /* Convert 24 bit VNI to 64 bit tunnel ID. */ | |
68 | static __be64 vni_to_tunnel_id(__u8 *vni) | |
69 | { | |
70 | #ifdef __BIG_ENDIAN | |
71 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; | |
72 | #else | |
73 | return (__force __be64)(((__force u64)vni[0] << 40) | | |
74 | ((__force u64)vni[1] << 48) | | |
75 | ((__force u64)vni[2] << 56)); | |
76 | #endif | |
77 | } | |
78 | ||
79 | static void geneve_rcv(struct geneve_sock *gs, struct sk_buff *skb) | |
80 | { | |
81 | struct vport *vport = gs->rcv_data; | |
82 | struct genevehdr *geneveh = geneve_hdr(skb); | |
83 | int opts_len; | |
84 | struct ovs_tunnel_info tun_info; | |
85 | __be64 key; | |
86 | __be16 flags; | |
87 | ||
88 | opts_len = geneveh->opt_len * 4; | |
89 | ||
90 | flags = TUNNEL_KEY | TUNNEL_OPTIONS_PRESENT | | |
91 | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0) | | |
92 | (geneveh->oam ? TUNNEL_OAM : 0) | | |
93 | (geneveh->critical ? TUNNEL_CRIT_OPT : 0); | |
94 | ||
95 | key = vni_to_tunnel_id(geneveh->vni); | |
96 | ||
97 | ovs_flow_tun_info_init(&tun_info, ip_hdr(skb), key, flags, | |
98 | geneveh->options, opts_len); | |
99 | ||
100 | ovs_vport_receive(vport, skb, &tun_info); | |
101 | } | |
102 | ||
103 | static int geneve_get_options(const struct vport *vport, | |
104 | struct sk_buff *skb) | |
105 | { | |
106 | struct geneve_port *geneve_port = geneve_vport(vport); | |
107 | __be16 sport; | |
108 | ||
109 | sport = ntohs(inet_sk(geneve_port->gs->sock->sk)->inet_sport); | |
110 | if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, sport)) | |
111 | return -EMSGSIZE; | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static void geneve_tnl_destroy(struct vport *vport) | |
116 | { | |
117 | struct geneve_port *geneve_port = geneve_vport(vport); | |
118 | ||
119 | geneve_sock_release(geneve_port->gs); | |
120 | ||
121 | ovs_vport_deferred_free(vport); | |
122 | } | |
123 | ||
124 | static struct vport *geneve_tnl_create(const struct vport_parms *parms) | |
125 | { | |
126 | struct net *net = ovs_dp_get_net(parms->dp); | |
127 | struct nlattr *options = parms->options; | |
128 | struct geneve_port *geneve_port; | |
129 | struct geneve_sock *gs; | |
130 | struct vport *vport; | |
131 | struct nlattr *a; | |
132 | int err; | |
133 | u16 dst_port; | |
134 | ||
135 | if (!options) { | |
136 | err = -EINVAL; | |
137 | goto error; | |
138 | } | |
139 | ||
140 | a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); | |
141 | if (a && nla_len(a) == sizeof(u16)) { | |
142 | dst_port = nla_get_u16(a); | |
143 | } else { | |
144 | /* Require destination port from userspace. */ | |
145 | err = -EINVAL; | |
146 | goto error; | |
147 | } | |
148 | ||
149 | vport = ovs_vport_alloc(sizeof(struct geneve_port), | |
150 | &ovs_geneve_vport_ops, parms); | |
151 | if (IS_ERR(vport)) | |
152 | return vport; | |
153 | ||
154 | geneve_port = geneve_vport(vport); | |
155 | strncpy(geneve_port->name, parms->name, IFNAMSIZ); | |
156 | ||
157 | gs = geneve_sock_add(net, htons(dst_port), geneve_rcv, vport, true, 0); | |
158 | if (IS_ERR(gs)) { | |
159 | ovs_vport_free(vport); | |
160 | return (void *)gs; | |
161 | } | |
162 | geneve_port->gs = gs; | |
163 | ||
164 | return vport; | |
165 | error: | |
166 | return ERR_PTR(err); | |
167 | } | |
168 | ||
169 | static int geneve_tnl_send(struct vport *vport, struct sk_buff *skb) | |
170 | { | |
171 | struct ovs_key_ipv4_tunnel *tun_key; | |
172 | struct ovs_tunnel_info *tun_info; | |
173 | struct net *net = ovs_dp_get_net(vport->dp); | |
174 | struct geneve_port *geneve_port = geneve_vport(vport); | |
175 | __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport; | |
176 | __be16 sport; | |
177 | struct rtable *rt; | |
178 | struct flowi4 fl; | |
179 | u8 vni[3]; | |
180 | __be16 df; | |
181 | int err; | |
182 | ||
183 | tun_info = OVS_CB(skb)->egress_tun_info; | |
184 | if (unlikely(!tun_info)) { | |
185 | err = -EINVAL; | |
186 | goto error; | |
187 | } | |
188 | ||
189 | tun_key = &tun_info->tunnel; | |
190 | ||
191 | /* Route lookup */ | |
192 | memset(&fl, 0, sizeof(fl)); | |
193 | fl.daddr = tun_key->ipv4_dst; | |
194 | fl.saddr = tun_key->ipv4_src; | |
195 | fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos); | |
196 | fl.flowi4_mark = skb->mark; | |
197 | fl.flowi4_proto = IPPROTO_UDP; | |
198 | ||
199 | rt = ip_route_output_key(net, &fl); | |
200 | if (IS_ERR(rt)) { | |
201 | err = PTR_ERR(rt); | |
202 | goto error; | |
203 | } | |
204 | ||
205 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
206 | sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true); | |
207 | tunnel_id_to_vni(tun_key->tun_id, vni); | |
208 | skb->ignore_df = 1; | |
209 | ||
210 | err = geneve_xmit_skb(geneve_port->gs, rt, skb, fl.saddr, | |
211 | tun_key->ipv4_dst, tun_key->ipv4_tos, | |
212 | tun_key->ipv4_ttl, df, sport, dport, | |
213 | tun_key->tun_flags, vni, | |
214 | tun_info->options_len, (u8 *)tun_info->options, | |
215 | false); | |
216 | if (err < 0) | |
217 | ip_rt_put(rt); | |
218 | error: | |
219 | return err; | |
220 | } | |
221 | ||
222 | static const char *geneve_get_name(const struct vport *vport) | |
223 | { | |
224 | struct geneve_port *geneve_port = geneve_vport(vport); | |
225 | ||
226 | return geneve_port->name; | |
227 | } | |
228 | ||
229 | const struct vport_ops ovs_geneve_vport_ops = { | |
230 | .type = OVS_VPORT_TYPE_GENEVE, | |
231 | .create = geneve_tnl_create, | |
232 | .destroy = geneve_tnl_destroy, | |
233 | .get_name = geneve_get_name, | |
234 | .get_options = geneve_get_options, | |
235 | .send = geneve_tnl_send, | |
236 | }; |